Commercial Timbers

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H. G. Richter and M. J. Dallwitz

Inga uruguensis Hook & Arn. (Ingá)

Nomenclature etc. FABACEAE-MIMOSOIDEAE. = Inga vera Willd. subsp. affinis (DC.) T.D. Penn. Trade and local names: ingá pytã (PY); ingá colorado (AR); ingazeiro, ingá de quatro quinas, ingá banana, pacay (BR). Not protected under CITES regulations.

Description based on 2 specimens. Tree. Geographic distribution: tropical South America, southern Brazil, and temperate South America.

General. Growth ring boundaries distinct. Growth ring boundaries demarcated by a band of radially flattened fibres. Heartwood basically brown and red (ochre with a pinkish tinge according to "Celulosa Argentina 1975"), with streaks. Density 0.77 g/cm³.

Vessels. Vessels present. Wood diffuse-porous. Vessels arranged in no specific pattern, in multiples, commonly short (2–3 vessels) radial rows. Vessel outline rounded. Two distinct vessel diameter classes absent. Average tangential vessel diameter 59–130–203 µm; diameter of vessel lumina: large. Average number of vessels/mm² 4; vessels per square millimetre very few. Perforation plates simple. Intervessel pits alternate, average diameter (vertical) 6–8 µm, medium, vestured. Vessel-ray pits with distinct borders, similar to intervessel pits, of uniform size or type, of the same type in adjacent elements, located throughout the ray. Helical thickenings absent. Tyloses in vessels absent. Other deposits in heartwood vessels present, mit braunen organischen Inhalten with brown organic contents.

Tracheids and fibres. Vascular or vasicentric tracheids sporadic to absent. Fibres very thin-walled. Fibre pits mainly restricted to radial walls, simple to minutely bordered. Fibres exclusively septate. Septate fibres evenly distributed.

Axial parenchyma. Axial parenchyma present, not banded. Axial parenchyma apotracheal and paratracheal. Apotracheal axial parenchyma diffuse (crystals generally prismatic). Paratracheal axial parenchyma vasicentric, aliform, and confluent. Aliform parenchyma lozenge. Axial parenchyma as strands. Average number of cells per axial parenchyma strand 2(–4). Unlignified parenchyma absent.

Rays. Rays present, 6–9–11 per tangential mm, multiseriate (also if only few), (1–)2–3 cells wide, narrow (2–3 seriate). Rays with multiseriate portions as wide as uniseriate portions absent. Aggregate rays absent. Rays of one size. Rays composed of a single cell type (homocellular); homocellular ray cells procumbent. Sheath cells absent. Tile cells absent. Perforated ray cells absent. Disjunctive ray parenchyma end walls indistinct or absent.

Storied structures. Storied structure absent.

Secretory structures. Oil and mucilage cells absent. Intercellular canals absent. Laticifers or tanniniferous tubes absent.

Cambial variants. Included phloem absent. Other cambial variants absent.

Mineral inclusions. Crystals present, prismatic, located in axial parenchyma cells. Crystal-containing axial parenchyma cells chambered. Number of crystals per cell or chamber one. Crystal containing cells of normal size. Cystoliths absent. Silica not observed.

Physical and chemical tests. Heartwood fluorescent. Water extract not fluorescent; basically colourless to brown or shade of brown. Heartwood extractives not leachable by water. Ethanol extract fluorescent (light yellow, in traumatic tissues only). Colour of ethanol extract colourless to brown or shade of brown. Chrome azurol-S test negative. Froth test positive (weakly). Splinter burns to partial ash. Ash white to grey.

Illustrations. • Transverse section. Inga uruguensis. • Tangential section. Inga uruguensis. • Radial section. Inga uruguensis.


The interactive key allows access to the character list, illustrations, full and partial descriptions, diagnostic descriptions, differences and similarities between taxa, lists of taxa exhibiting specified attributes, summaries of attributes within groups of taxa, and geographical distribution.

Cite this publication as: ‘Richter, H.G., and Dallwitz, M.J. 2000 onwards. Commercial timbers: descriptions, illustrations, identification, and information retrieval. In English, French, German, Portuguese, and Spanish. Version: 25th June 2009. http://delta-intkey.com’.

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